Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Kulyk, V." wg kryterium: Autor

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 27
Tytuł:
Determination of basic gas reservoir parameters from radioactive logging taking into account PT-conditions
Określanie podstawowych parametrów gazonośnych skał zbiornikowych za pomocą kombinacji odwiertowych profilowań radiometrycznych z uwzględnieniem warunków ciśnienia i temperatury
Autorzy:
Bondarenko, M.
Kulyk, V.
Powiązania:
https://bibliotekanauki.pl/articles/1835427.pdf
Data publikacji:
2017
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
gas reservoirs
pressure-temperature conditions
density-neutron loggings
apparent and true porosities of gas reservoirs
identification parameter
gas saturation
volume gas content
gazonośne skały zbiornikowe
termiczno-ciśnieniowe warunki
kombinacja odwiertowych profilowań gamma-gamma gęstościowego i neutron-neutron
pozorna i rzeczywista porowatość gazonośnych skał zbiornikowych
parametr identyfikacyjny,
nasycenie gazem
objętościowa zawartość gazu
Opis:
The paper suggests methods for determining the basic parameters of ordinary and unconventional gas reservoirs, namely identification parameter, true porosity, gas saturation and volume gas content. The set of these parameters can be obtained in both open wells and cased wells with the help of a combination of density and neutron loggings taking into account PT-conditions of gas reservoirs occurrence (up to 10 km). The application of developed approaches for the estimation of the petrophysical parameters of gas reservoirs are demonstrated by the example of cased gas well.
W artykule zaproponowano sposoby wyznaczania głównych parametrów, w konwencjonalnych i niekonwencjonalnych gazonośnych skałach zbiornikowych, tzw. parametr identyfikacyjny, rzeczywistą porowatość, nasycenie gazem, objętościową zawartość gazu. Zestaw tych parametrów może być otrzymany zarówno w niezarurowanych, jak i zarurowanych otworach wiertniczych, za pomocą kombinacji radiometrycznych profilowań z uwzględnieniem zmiennych ciśnień i temperatury w skałach zbiornikowych (do 10 km). Zastosowanie przedstawionych w artykule sposobów dla liczbowej oceny petrofizycznych parametrów, gazonośnych skał zbiornikowych zademonstrowano na przykładzie odwiertu zarurowanego.
Źródło:
Nafta-Gaz; 2017, 73, 3; 162-168
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Certain methods of complementation of linear extensions of dynamic systems to regular systems
Pewne metody dopełnienia liniowych rozszerzeń układów dynamicznych do układów regularnych
Autorzy:
Kulyk, V.
Pączko, D.
Powiązania:
https://bibliotekanauki.pl/articles/87349.pdf
Data publikacji:
2014
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
linear extension
dynamical system
regular system
rozszerzenie liniowe
układ dynamiczny
układ regularny
Opis:
The paper presents a method of transformation of two weakly regular systems into one regular system. The method has been generalised to any number of weakly regular systems.
W artykule przedstawiono metodę doprowadzenia dwóch układów słabo regularnych do jednego układu regularnego. Metoda została uogólniona na dowolną liczbę układów słabo regularnych.
Źródło:
Zeszyty Naukowe. Matematyka Stosowana / Politechnika Śląska; 2014, 4; 41-55
2084-073X
Pojawia się w:
Zeszyty Naukowe. Matematyka Stosowana / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Differences between Fe₃O₄ Micro- and Nanoparticles Properties
Autorzy:
Duriagina, Z.
Tepla, T.
Kulyk, V.
Powiązania:
https://bibliotekanauki.pl/articles/1030923.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
Fe₃O₄ micro- and nanoparticles
atomic-force microscopy
magnetization
superparamagnetism
Opis:
Small sizes of nanoparticles lead to the appearance of new unique functional properties. Under transition to nanosizes in metals and their compounds new specific characteristics appears. In this work, the microstructural and magnetic properties of Fe₃O₄ nanoparticles (Fe₃O₄-NP) have been compared with those of commercially available Fe₃O₄ microparticles (Fe₃O₄-MP) and detailed analysis of differences has been carried out. The synthesis of Fe₃O₄-NP was carried out by means of colloidal method performed without the use of surfactants. Commercial and synthesized particles were characterized using NTEGRA Prima (NT-MDT) atomic force microscope. For magnetic properties investigations we used the method of vibrating sample magnetometer.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 869-872
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizacija rezhimov kolebanij zernovyh smesej pri nalichii suhogo trenija
Optimization of vibration grain mixes with dry friction
Autorzy:
Lovejkin, V.
Chovnyuk, J.
Kulyk, V.
Powiązania:
https://bibliotekanauki.pl/articles/77171.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2012, 14, 3
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The peculiarities of fatigue process zone formation of structural materials
Osobliwości tworzenia strefy procesu zmęczeniowego w materiałach konstrukcyjnych
Autorzy:
Chepil, R.
Vira, V.
Kulyk, V.
Kharchenko, Y.
Duriagina, Z.
Powiązania:
https://bibliotekanauki.pl/articles/329634.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
fatigue
durability
fatigue process zone
crack initiation
crack growth
defects of materials
zmęczenie
trwałość
strefa procesu zmęczeniowego
inicjacja pęknięcia
propagacja pęknięcia
defekty materiałowe
Opis:
It is shown that with a cyclic loading in the vicinity of the stress concentrator within the static and cyclic plastic zones, a specific volume of material is gradually formed - the fatigue process zone. Its size d* determines the length of non-propagated cracks or safety defects in the material and can be a determining factor in the diagnosis of material damage. For these materials, the size d* does not depend a lot on the type and geometric characteristics of the stress concentrator. It can be determined by laboratory conditions. While detecting the defects which are longer than d* , it is decided to reduce the intervals between inspections of the construction element, repair or replace it.
Pokazano, że cykliczne obciążenie w pobliżu koncentratora naprężeń w statycznych i cyklicznych strefach plastycznych stopniowo tworzy specyficzną objętość materiału - strefę procesu zmęczeniowego. Jej rozmiar d* określa długość nierosnących pęknięć lub innych bezpiecznych defektów i może być czynnikiem decydującym w diagnozie uszkodzeń materiału. Dla badanych materiałów rozmiar d* mało zależy od rodzaju i geometrycznych charakterystyk koncentratora naprężeń. Można go wyznaczyć w warunkach laboratoryjnych. Po ujawnieniu defektów, dłuższych niż d* , podejmuje się decyzję o skróceniu czasu między przeglądami elementów konstrukcji, jego remoncie lub zamianie.
Źródło:
Diagnostyka; 2018, 19, 4; 27-32
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of conditions for loss of bearing capacity of underground ammonia pipelines based on the monitoring data and flexible search algorithms
Autorzy:
Mysiuk, R.V.
Yuzevych, V.M.
Yasinskyi, M.F.
Kniaz, S.V.
Duriagina, Z.A.
Kulyk, V.V.
Powiązania:
https://bibliotekanauki.pl/articles/24200550.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
underground ammonia pipeline
pump station
thermal background
corrosion current
data processing
cloud computing
podziemny rurociąg amoniaku
stacja pomp
tło termiczne
prąd korozyjny
przetwarzanie danych
chmura obliczeniowa
Opis:
Purpose: The study aims to diagnose the corrosion current density in the coating defect on the outer surface of the ammonia pipe depending on the distance to the pumping station, taking into account the interaction of media at the soil-steel interface and using modern graphical data visualization technologies and approaches to model such a system. Design/methodology/approach: The use of an automated system for monitoring defects in underground metallic components of structures, in particular in ammonia pipelines, is proposed. The use of the information processing approach opens additional opportunities in solving the problem of defect detection. Temperature and pressure indicators in the pipeline play an important role because these parameters must be taken into account in the ammonia pipeline for safe transportation. The analysis of diagnostic signs on the outer surface of the underground metallic ammonia pipeline is carried out taking into account temperature changes and corrosion currents. The parameters and relations of the mathematical model for the description of the influence of thermal processes and mechanical loading in the vicinity of pumping stations on the corresponding corrosion currents in the metal of the ammonia pipeline are offered. Findings: The paper evaluates the corrosion current density in the coating defect on the metal surface depending on the distance to the pumping station and the relationship between the corrosion current density and the characteristics of the temperature field at a distance L = 0…20 km from the pumping station. The relative density of corrosion current is also compared with the energy characteristics of the surface layers at a distance L = 0…20 km from the pumping station. An information system using cloud technologies for data processing and visualization has been developed, which simplifies the process of data analysis regarding corrosion currents on the metal surface of an ammonia pipeline. Research limitations/implications: The study was conducted for the section from the pumping station to the pipeline directly on a relatively small data set. Practical implications: The use of client-server architecture has become very popular, thanks to which monitoring can be carried out in any corner of the planet, using Internet data transmission protocols. At the same time, cloud technologies allow you to deploy such software on remote physical computers. The use of the Amazon Web Service cloud environment as a common tool for working with data and the ability to use ready-made extensions is proposed. Also, this cloud technology simplifies the procedure of public and secure access to the collected information for further analysis. Originality/value: Use of cloud environments and databases to monitor ammonia pipeline defects for correct resource assessment.
Źródło:
Archives of Materials Science and Engineering; 2022, 115, 1; 13--20
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boosting-based model for solving Sm-Co alloy’s maximum energy product prediction task
Autorzy:
Trostianchyn, A.M.
Izonin, I.V.
Duriagina, Z.A.
Tkachenko, R.O.
Kulyk, V.V.
Havrysh, B.M.
Powiązania:
https://bibliotekanauki.pl/articles/24200577.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
Sm-Co alloy
ensemble learning
gradient boosting
prediction accuracy
Stop Sm-Co
uczenie zespołowe
dokładność przewidywania
Opis:
Purpose: This paper aims to decide the Sm-Co alloy’s maximum energy product prediction task based on the boosting strategy of the ensemble of machine learning methods. Design/methodology/approach: This paper examines an ensemble-based approach to solving Sm-Co alloy’s maximum energy product prediction task. Because classical machine learning methods sometimes do not supply acceptable precision when solving the regression problem, the authors investigated the boosting ML model, namely Gradient Boosting. Building a boosting model based on several weak submodels, each of which considers the errors of the prior ones, provides substantial growth in the accuracy of the problem-solving. The obtained result is confirmed using an actual data set collected by the authors. Findings: This work demonstrates the high efficiency of applying the ensemble strategy of machine learning to the applied problem of materials science. The experiments determined the highest accuracy of solving the forecast task for the maximum energy product of Sm-Co alloy formed on the boosting model of machine learning in comparison with classical methods of machine learning. Research limitations/implications: The boosting strategy of machine learning, in comparison with single algorithms of machine learning, requires much more computational and time resources to implement the learning process of the model. Practical implications: This work demonstrated the possibility of effectively solving Sm-Co alloy’s maximum energy product prediction task using machine learning. The studied boosting model of machine learning for solving the problem provides high accuracy of prediction, which reveals several advantages of their use in solving issues applied to computational material science. Furthermore, using the Orange modelling environment provides a simple and intuitive interface for using the researched methods. The proposed approach to the forecast significantly reduces the time and resource costs associated with studying expensive rare earth metals (REM)-based ferromagnetic materials. value: The authors have collected and formed a set of data on predicting the maximum energy product of the Sm-Co alloy. We used machine learning tools to solve the task. As a result, the most increased forecasting precision based on the boosting model is demonstrated compared to classical machine learning methods.
Źródło:
Archives of Materials Science and Engineering; 2022, 116, 2; 71--80
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessing surface fatigue crack growth in railway wheelset axle
Autorzy:
Rudavskyi, D. V.
Kaniuk, Yu. I.
Duriagina, Z. A.
Kulyk, V. V.
Shefer, M. S.
Dolinska, I. Ya.
Powiązania:
https://bibliotekanauki.pl/articles/1818483.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
fatigue crack growth
mixed mode
railway axles
stress intensity factor
estimation model
wzrost pęknięć zmęczeniowych
tryb mieszany
osie kolejowe
współczynnik intensywności naprężeń
model szacowania
Opis:
Purpose: The aim of the proposed research is to create a calculation model of surface fatigue crack growth at the axle of railway wheelset working under operational loads. Design/methodology/approach: The energy approach of the fracture mechanics was used to formulate the calculation model of fatigue crack propagation at the wheelset axle surface. The method of least squares was used to determine the investigated material mechanical constants that the kinetic equations of the calculation model contain. The system of differential equations of crack growth kinetics was solved numerically using the Runge-Kutta method. Findings: On the basis of the energy approach of the fracture mechanics the calculation model of fatigue macrocrack growth in three-dimensional elastic-plastic body in case of a mixed-mode I+II+III macromechanism of fracture has been built. On the basis of the created calculation model, the kinetics of the growth of fatigue cracks was investigated both in the middle part of the wheelset axle and in the axle journal. Research limitations/implications: The results obtained on laboratory specimens should be tested during a real railway wheelset axle investigation. Practical implications: The created calculation model can be used in practice to formulate method of residual lifetime estimation of railway wheelset axle. Originality/value: It was shown, that surface crack kinetics depends not only on the crack initial area but also significantly depends on the crack edge geometry and comparatively small crack-like defects at the wheelset axle surface can reach critical sizes in comparatively short run. It has been found that mechanical shear stresses caused by the weight of the loaded railway wagon in the cross section of the wheelset axle journal can significantly accelerate the growth of the transverse fatigue crack at the axle surface, reducing the period of crack subcritical growth by about 20%.
Źródło:
Archives of Materials Science and Engineering; 2020, 106, 2; 59--67
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Information support of optimal control of modes of electric systems with renewable energy sources
Autorzy:
Kulyk, V. V.
Bartetska, I. A.
Buslavets, O. A.
Gryniewicz-Jaworska, M.
Powiązania:
https://bibliotekanauki.pl/articles/103356.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
renewable sources of electric energy
electric systems
optimal control
information support
Opis:
To provide necessary quality of electric energy and reliable supply and reduce environmental contamination as a result of energy units operation, renewable sources of energy (RSE), in particular solar electric stations (SES), wind electric stations (WES) and small hydropower stations (SHES) are intensively developed. The paper considers the conditions of optimality of renewable sources of energy (RSE) functioning in electric systems, controllability of which is limited by the impact of non-stable weather conditions. The influence of control system information support on the efficiency of RSE usage is shown.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 21-26
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of electrolyte composition on the plasma electrolyte oxidation and phase composition of oxide ceramic coatings formed on 2024 aluminium alloy
Autorzy:
Posuvailo, V. M.
Kulyk, V. V.
Duriagina, Z. A.
Koval’chuck, I. V.
Student, M. M.
Vasyliv, B. D.
Powiązania:
https://bibliotekanauki.pl/articles/1818491.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
microstructure
hydrogen peroxide
porosity
plasma electrolyte synthesis
plasma electrolyte oxidation
mikrostruktura
nadtlenek wodoru
porowatość
Opis:
Purpose: Purpose of this work is to analyse the process of synthesis of oxide ceramic coatings in plasma electrolytes on 2024 aluminium alloy and to form an electrolyte which allows to reduce energy consumption for the coating formation. Design/methodology/approach: The oxide ceramic coatings were synthesized on 2024 aluminium alloy. The coatings were formed by the alternate application of anode and cathode pulses to the sample. X-ray diffraction analysis of coatings was performed on a DRON-3.0 X-ray diffractometer using CuKa radiation. The thickness of the coatings was determined using a CHY TG-05 thickness gauge. The porosity of the coatings was investigated by analysing the micrographs of the plasma electrolyte oxidation (PEO) coatings obtained on a scanning electron microscope at x500 magnification using the image processing technique. Findings: The electrolyte with 5 g/l H2O2 additive have been elaborated as an optimal composition for synthesis of a coating with an increased content of corundum (a-Al2O3) as compared to a coating synthesized in the same mode in the 3KOH+2Na2SiO3 electrolyte without H2O2. This synthesis mode allows obtaining a coating with a high corundum content at low energy consumption. Research limitations/implications: For further optimization of the synthesis modes, it is necessary to analyse the influence of the phase composition and porosity of the obtained oxide ceramic coatings on their microhardness, wear resistance, and corrosion resistance. Practical implications: Based on the developed modes of synthesis of the coatings, it will be possible to obtain wear and corrosion resistant oxide ceramic coatings with predetermined functional properties and to reduce energy consumption for their formation. Originality/value: Methods for accelerating the formation of coatings have been proposed and tested, in particular, by adding various amounts of hydrogen peroxide to the electrolyte. The content of oxides in the obtained coatings, in particular, their ratios at various concentrations of hydrogen peroxide in the electrolyte, were determined by X-ray phase analysis. The modes of synthesis of the coatings were developed which allow obtaining a continuous coating without cracks with simultaneous decreasing porosity from 4.32% to 3.55-3.53%.
Źródło:
Archives of Materials Science and Engineering; 2020, 105, 2; 49--55
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the modification by ultrafine silicon carbide powder on the structure and properties of the Al-Si alloy
Autorzy:
Kovbasiuk, T. M.
Selivorstov, V. Yu.
Dotsenko, Yu. V.
Duriagina, Z. A.
Kulyk, V. V.
Kasai, O. M.
Voitovych, V. V.
Powiązania:
https://bibliotekanauki.pl/articles/1818500.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
Al-Si alloy
silicon carbide
modification
mechanical properties
microstructure
microhardness
Stop Al-Si
węglik krzemu
modyfikacja
właściwości mechaniczne
mikrostruktura
mikrotwardość
Opis:
Purpose: Determine the possibility of modifying aluminium alloys of the Al-Si system with an ultrafine SiC modifier with a particie size of 3-5 pm. Design/methodology/approach: Processing of the Al-Si alloy was carried out by introducing an ultrafine modifier in the amount of 0.1, 0.2, or 0.3 wt.%. Silicon carbide (SiC) with a particle size in the range of 3-5 pm was used as a modifier. To study the microstructure of the formed surface layers, a metallographic analysis was performed according to the standard method on a microscope MIKPOTEX® MMT-14C using TopView software. Microhardness studies of the samples were carried out on a Vickers microhardness tester NOVOTEST TC-MKV1. The microstructure of castings of the AlSi12 grade was studied at magnification from 100 to 400 times on the horizontal and vertical surfaces of the samples after etching with a 2% NaOH aqueous solution. Findings: Aluminium cast alloy of Al-Si system has been synthesized with the addition of 0.1, 0.2, and 0.3 wt.% ultrafine SiC modifier. It was found that the modification of the AlSi12 alloy by SiC particles of 3-5 pm in size led to an improvement of its microstructure due to the reduction of the volume fraction of micropores and primary Si crystals. It was shown that the AlSi12 aluminium alloy due to the modification by 0.2 wt.% SiC has the best micromechanical properties and macrostructure density. Research limitations/implications: The obtained research results are relevant for cast specimens of the indicated sizes and shapes. The studies did not take into account the influence of the scale factor of the castings. Practical implications: The developed modification technology was recommended for use in the conditions of the foundry "Dnipropetrovsk Aggregate Plant" (Dnipro, Ukraine). Originality/value: The technology of AlSi12 alloy modification of ultrafine SIC modifier with a particle size of 3-5 pm was used for the first time.
Źródło:
Archives of Materials Science and Engineering; 2020, 101, 2; 57--62
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of structural-geometric parameters and elemental composition of spherical VT20 alloy powders
Autorzy:
Duriagina, Z. A.
Filimonov, O. S.
Kulyk, V. V.
Lemishka, I. A.
Kuziola, R.
Powiązania:
https://bibliotekanauki.pl/articles/368582.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
spherical VT20 alloy powders
structural-geometric parameters
additive technologies
fluidity
bulk density
hydrodynamic radius
proszek sferyczny
technologie przyrostowe
płynność
gęstość objętościowa
promień hydrodynamiczny
Opis:
Purpose: Identification of structural-geometrical parameters, technological properties and elemental composition of spherical powders in a wide fraction range with respect to the VT20 alloy has been carried out. This is important for evaluating the optimum filling of a given volume by mixture of powders of different fractions during 3D printing. Design/methodology/approach: During the investigation of spherical Ti-alloy powders, a comprehensive approach was performed using Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDS), Dynamic Light Scattering (DLS) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The surface morphology of the powders was studied on a Tuescan Vega 3 Scanning Electron Microscope. Using the Quantax energy dispersive spectrometer, element distribution maps were obtained and histograms of element distribution in the investigated powders were constructed. ICP-MS analysis was performed to clarify the elemental composition. DLS analysis using Malvern's Zetasizer Nano-ZS equipment allowed us to determine the functional parameters (hydrodynamic radius – Rh, zeta potential – z and specific conductivity) of particles of titanium alloy powder that indirectly indicate a tendency to form conglomerates. Findings: According to the microscopic examinations, the VT20 alloy powder consists of globular-shaped particles with the lamellar traces on their surfaces. The uniformity of the chemical element distribution within each fraction of the investigated powders was confirmed by EDS, and the full conformity of the powder fractions with the elemental composition of the VT20 alloy was confirmed by ICP-MS. The DLS method allowed to establish that the formation of conglomerates would not occur within the studied fractions of the VT20 alloy powder. Research limitations/implications: The use of high sensitive investigation methods gives understanding of the mechanisms of fine structure formation and possibility to control the processes of powder coagulation in the stage of electrostatic interactions. Practical implications: The obtained results can be used for the formation of fine spherical particles of the powder, but at the same time, these technologies can be extended for the particles of non-spherical shape. Originality/value: The DLS method allowed to establish that the formation of conglomerates would not occur within the studied fractions of the VT20 alloy powder. This, in turn, will improve powder melting during 3D printing. The measured zeta potential values allowed us to reveal mechanisms of fine structure formation and to control the processes of powder coagulation in the stage of electrostatic interactions.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2019, 95, 2; 49-56
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical behavior of wheel steels with solid solution and precipitation hardening
Autorzy:
Kulyk, V. V.
Shipitsyn, S. Ya.
Ostash, O. P.
Duriagina, Z. A.
Vira, V. V.
Powiązania:
https://bibliotekanauki.pl/articles/378578.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
railway wheel steel
alloying
resistance to flat formation
wear
damaging
stalowe koło kolejowe
stopowanie
odporność na formowanie płaskie
zużycie
uszkodzenia
Opis:
Purpose: The aim of the proposed research is to investigate operational properties of a wheel steel treated with simultaneous solid solution and precipitation hardening at various carbon content, in comparison with the standard wheel grade T steel. Design/methodology/approach: The mechanical behaviour of wheel steels with increased content of silicon, manganese, vanadium, and nitrogen at various carbon content has been investigated and compared to that of the standard high-strength wheel grade T steel. The steels were undergo thermal treatment due to austenitic heating up to a temperature of 950.C with cooling down in water to 550.C followed by intense blowing of blanks in the air. After that, a tempering was performed at a temperature in the range of 450-650.C. Static strength (UTS), relative elongation (TEL), impact toughness tests (KCV) were determined on standard specimens. The characteristics of Mode I fatigue crack growth resistance of steel were determined on the basis of fatigue macrocrack growth rate diagrams da/dN–ΔKI, obtained by the standard method on compact specimens with the thickness of 10 mm at a frequency of 10-15 Hz and the stress ratio R = 0.1 and R = 0.5 of the loading cycle. The characteristics of Mode II fatigue crack growth resistance were determined on the basis of da/dN–ΔKII diagrams, obtained earlier method on edge notched specimens with the thickness 3.2 mm at a frequency of 10-15 Hz and R = -1 taking account of the crack face friction. Rolling contact fatigue testing was carried out on the model specimens. Findings: The regularities of the change of mechanical characteristics of the high-strength wheel steel with simultaneous solid solution and precipitation hardening at lowered carbon content under static, impact and cyclic loading are studied. Research limitations/implications: The results obtained using laboratory samples should be checked during a real railway wheels investigation. Practical implications: The investigated steel with simultaneous solid solution and precipitation hardening provides high wear resistance of the tread surface and damage resistance determined on the model wheels. Originality/value: A steel with solid solution hardening due to increased content of silicon (up to 0.7%) and manganese (up to 0.8%) and also with precipitation hardening (at optimal content of vanadium and nitrogen [V‧N]‧104 = 28.9%) at lowered carbon content (0.52) possesses high strength and fatigue fracture toughness in cases of Mode I and Mode II loading, causing better combination of wear and damage resistances of the tread surface of the model wheels, as compared to corresponding parameters for grade T steel.
Źródło:
Archives of Materials Science and Engineering; 2019, 95, 2; 49-54
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of water vapor containing hydrogenous atmospheres on the micro-structure and tendency to brittle fracture of anode materials of YSZ–NiO(Ni) system
Autorzy:
Kulyk, V.V.
Vasyliv, B.D.
Duriagina, Z.A.
Kovbasiuk, T.M.
Lemishka, I.A.
Powiązania:
https://bibliotekanauki.pl/articles/2175787.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
YSZ–NiO ceramics
hydrogen
water vapor
ceramika YSZ-NiO
wodór
para wodna
Opis:
Purpose: The purpose of this work is to estimate the tendency to brittle fracture of the YSZ–NiO(Ni) anode cermet in a hydrogenous environment with various concentrations of water vapor. Design/methodology/approach: YSZ–NiO ceramic plates were fabricated by sintering in an argon atmosphere. The treatment of material was performed in a hydrogenous environment with various concentrations of water vapor. The strength test was performed under three-point bending at 20°C in air. The microstructure and morphology of the fracture surface of the specimens were studied using a scanning electron microscope (SEM) Carl Zeiss EVO-40XVP. The chemical composition was determined using an INCA ENERGY 350 spectrometer. Microhardness measurements were performed on a NOVOTEST TC-MKB1 microhardness tester. The configuration of the imprints and cracks formed was studied on an optical microscope Neophot-21. The porosity of the materials was investigated by analysing the SEM micrographs using the image processing technique. Findings: Peculiarities of changes in the microstructure, the morphology of specimens fracture surface, physical and mechanical characteristics of YSZ–NiO(Ni) material for solid oxide fuel cell (SOFC) anodes of different preconditioning modes aged under various partial pressures of water vapor in a hydrogenous environment are found. Research limitations/implications: To study the actual behaviour of the YSZ–NiO(Ni) anode material in the operating environment, it is necessary to evaluate its strength, Young’s modulus, microhardness, and fracture toughness by changing with a certain step the partial pressure of water vapor in the whole range noted in this work.Practical implications: Based on the developed approach to assessing the propensity to brittle fracture of the formed cermet microstructure, it is possible to obtain an anode material that will provide the necessary functional properties of a SOFC. Originality/value: An approach to estimating the propensity to brittle fracture of a formed cermet structure is proposed based on the microhardness and fracture toughness characteristics obtained by the Vickers indentation method.
Źródło:
Archives of Materials Science and Engineering; 2021, 108, 2; 49--67
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and electrochemical properties of the vanadium alloys after low-temperature nitrogen plasma treatment
Autorzy:
Duriagina, Z. A.
Ryzhak, D. D.
Kulyk, V. V.
Tepla, T. L.
Lemishka, I. A.
Bohun, L. I .
Powiązania:
https://bibliotekanauki.pl/articles/1818517.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
vanadium alloy
surface layers
microhardness
corrosion
stop wanadu
warstwy powierzchniowe
mikrotwardość
korozja
Opis:
Purpose: The proposed research aims to determine the expediency of surface treatment of vanadium alloys of V-Cr and V-Ti systems due to irradiation of their surfaces with low- temperature nitrogen plasma using plasma torch NO-01. Design/methodology/approach: The investigation of microstructure and X-ray fluorescence analysis (XRF) of the samples were performed using an electron microscope TESCAN Vega3. The microhardness (Vickers hardness) of the samples was measured before and after surface treatment. The study of corrosive properties of the surface layers was performed by an electrochemical impedance spectroscopy (EIS) method. Corrosion damages were identified using impedance dependences. Findings: The microstructure of the surface layers of the V-8Ti, V-15Cr, and V-35Cr alloys in the initial state and after plasma treatment have been investigated. The chemical composition of the surface layers is determined and comparative measurements of the microhardness of these alloys are carried out. Corrosion-electrochemical properties (corrosion potentials, electrochemical impedance spectroscopy and constructed potential-dynamic polarization curves) of investigated alloys after treatment with nitrogen plasma are evaluated. Research limitations/implications: The results obtained using laboratory samples should be checked at the conditions of power equipment operation. Practical implications: This treatment has advantages over other methods of surface engineering since it provides strong surface plastic deformation and the possibility of formation of secondary phases resulting in increases in surface hardness and corrosion resistance. Originality/value: Vanadium alloys have significant advantages over other structural materials due to their high thermal conductivity and swelling resistance, high strength and plasticity up to temperatures of 700-800°C, and good weldability.
Źródło:
Archives of Materials Science and Engineering; 2020, 102, 1; 5--12
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 27

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies